7.发射子弹判断子弹越界后销毁

1.添加子弹类继承FlySprite 实现ActionSprite
public class Bullet extends FlySprite implements ActionSprite {

public Bullet(int x,int y){<br />        this.init();<br />        super.x = x;<br />        super.y = y;<br />    }
@Override<br />    public void init() {<br />        super.image = ImageLoaderUtil._load_("bullet2.png");<br />        super.width = image.getWidth()/2;<br />        super.height = image.getHeight()/2;<br />    }
@Override<br />    public void destroy() {<br />        //移除集合当中越界子弹对象<br />        FlyPanel._bulletList_.remove(this);<br />    }
int SPEED = 5;<br />    _/**<br />     * 子弹向上运行<br />     */<br />    _@Override<br />    public void up() {<br />        //y 垂直方向 移动， 减 向上<br />        super.y=y-SPEED;<br />        if(super.y<0){<br />            this.destroy();<br />        }<br />    }<br />}

2.英雄类中添加发射子弹方法
FlyPanel类中添加公共的静态子弹列表
//创建子弹集合
public static CopyOnWriteArrayList bulletList = new CopyOnWriteArrayList();
Hero玩家类中添加发射子弹的方法
public void shoot() {
int xStep = this.width / 4;
Bullet bullet = new Bullet(this.x + 2 * xStep, this.y - 20);
FlyPanel.bulletList.add(bullet);
}
3.把子弹渲染到页面上
ShootTask shootTask;
class ShootTask extends TimerTask {
@Override
public void run() {
hero.shoot();
//重绘
repaint();
}
}

@Override
public void paint(Graphics g) {
//画背景图片
g.drawImage(background, x, y, bgWidth, bgHeight, null);
paintState(g);
hero.draw(g);
//绘制子弹
for (Bullet b : bulletList) {
b.draw(g);
b.up();
}
}

4.删除越界子弹
@Override
public void up() {
this.y=y-5;
if (this.y < 0) {
this.destroy();
}
}

@Override
public void destroy() {
FlyPanel.bulletList.remove(this);
}

case START:
gameState = GameState.RUNNING;
bgRoll = new BgRoll();
shootTask = new ShootTask();
timer.schedule(bgRoll,0,50);
timer.schedule(shootTask,0,200);
break;
case RUNNING:
gameState= GameState.PAUSE;
bgRoll.cancel();
shootTask.cancel();
repaint();
break;
case PAUSE:
gameState = GameState.RUNNING;
bgRoll = new BgRoll();
shootTask = new ShootTask();
timer.schedule(bgRoll,0,50);
timer.schedule(shootTask,0,200);
break;